Portable metal-sawing machine



(N0.M0de1.) 2 Sheets-Sheet 1. I G. W. TRQWBRIDGE.

PORTABLE METAL SAWING MACHINE.

No. 388,602. Patented Aug. 28; 1888.

8 I s Q H N' o k (No Model.) 2 Sheets-Sheet 2. C. W. TROWBRIDGE.

PORTABLE METAL SAWING MACHINE.

No. 888,602. I Patented Aug. 28, 1888.

UNITED STATES PATENT OFFICE."

CHARLES W. TROWBRIDGE, or CHICAGO, ILLINOIS.

PORTABLE METAL-SAWING MACHINE.

SPECIFICATION forming part of Letters Patent No. 388.602, dated August 28, 1888.

(No model.)

1'0 aZZ wlwnt it may concern:

Be it known that 1, CHARLES W. TRow- BRIDGE, residing at Chicago, in the county of Cook and State of Illinois, and a citizen of the United States, have invented a new and useful Improvement'in Portable Metal- Sawing Machines, of which the following is a specification, reference'being had to the accompanying drawings, in which- Figure 1 is a side elevation. Fig. 2 is a de tail, being a section at line 2 of Fig. 1. Fig. 3 is an end view looking from the left hand of Fig. 1. Fig. 4 is a section at line 4 of Fig. 1, looking to the left. Figs. 3 and 4 are on a smaller scale than Fig. 1. I

The leading object of this invention is to provide a portable machine having two saws arranged to cut in different directions for the purpose of cutting the ends of iron beams, as is frequently necessary in building, although the machine may be used for other purposes, which object I accomplish by providing a guide which is to be clamped to the article to be cut and a frame moving upon said guide, which frame carries the two saws, and by providing devices for rotating the saws, and at the same time moving the frame upon the guide, all as illustrated in the drawings and hereinafter described. That which I claim as new will be pointed out in the claims.

In the drawings, A representsa beam which, as shown, is provided with flanges a. B is a fixed jaw upon one end or side ofa plate, 0, in which there isa long slot, 1). Dis a movable jaw projecting upward through the slot 1), the jaw being integral with the block 0. E is a strong casting. F is a rib on such casting E. G is a guide. The parts I3, D, E, F, and G are all cast together.

His a screw which passes through the rib F and into the block a for the purpose of operating the movable jaw D.

I is a casting, which may be considered as the main frame. It is provided with lips d, which engage with the guide G, on which the frame I moves.

J is a bearing for a shaft, K, which carries a saw, L. M is a bearing for another shaft, N, which carries the saw 0. The shaft K is provided with a screw thread, c, with which the worm-pinion f engages.

P is a screw-threaded shaft on which the pinion f is located.

Z is a crank on the shaft P.

m is apin used to prevent the crank and shaft I? from rotating.

n is a strengthening-piece.

The frame I, the bearings J M k, and the fixed parts connected therewith are all to be cast together.

o is a revolving pin orshort shaft located in the end of the shaft N. Its inner end is provided with a groove, 12, into which a pin, g, which is fixed in the shaft N, enters. This pin 0 can rotate independently of the shaft N. It is provided with a square end to receive a crank or other operating device. On this revolving pin 0 is a pinion, r.

s is a gear-wheel on the shaft 2;.

t is a pinion on the shaft v.

a is a gear-wheel on the shaft N.

When the plate t and wheel 9 are removed, the pinion fcan be inserted into the chamber Q. Then the shaftPcan be inserted through the pinion and be secured in place. The beveled wheel j can also be inserted in the chanr her and placed upon its shaft. Then the wheel g and the plate a can be replaced.

The operation is as follows: The machine is to be secured to the material to be operated upon by means of the clampingjaws, which can be firmly clamped upon the article by means of the screw I-I. Then by rotating the revolving pin 0 motion will be given through the pinion r and wheel 8 to the beveled wheel j, which, engaging with the wheel g,will cause it to rotate, revolving the shaft K and giving motion to the saw L. At the same time motion will be given to the saw 0 through the pinion t and wheel a, the latter being upon the shaft N, which carries the saw 0. At the same time the rotation of the shaft Kwill, through the worm 0, cause the pinion f to rotate upon the screw-shaft P,which motion will cause the frame I, which carries the saws, to move on the guide G. When the saws are arranged as shown, the saw L will out into the beam at right angles and the other saw, 0, will cut on an inclined line, cutting out a piece from the beam. When the saws have completed their work, they can be restored to their former positions by removing the pin m and rotating the shaft P in the proper direction, moving the frame I upon the guide G.

In actual use it will probably be desirable, usually, to place the beam upon its side, and then the frame will move in a vertical direc tion instead of in a horizontal direction. If Fig. 1 be regarded as a plan view instead of a side elevation, it will represent the position of the machine and beam when arranged as last mentioned.

The saws of different machines can be arranged at different angles, as required for the work to be performed, and they may be driven in the same direction or in opposite directions.

I do not limit myself to the exact arrange ment of operating devices shown.

What I claim'as new, and desire to secure by Letters Patent, is as follows:

1. A guide, as G, adapted to be secured to the material to be out, in combination with a sliding frame, as I, carrying two saws, as L and 0, supported by shafts in bearings connected with the sliding frame, substantially as and for the purpose specified.

2. A guide, as G, adapted to be secured to the material to be cut, in combination with a sliding frame, as I, carrying two saws, as L and 0, supported on shafts in bearings connected with the sliding frame, and shaft K, provided with a screw-thread, e, and wormpinionf, and screw-thrcaded shaft P, substantially as and for the purposes specified.

CHARLES \V; TROWBRIDGE.

Witnesses:

ALBERT H. ADAMS, HARRY 'l. J ONES. 

